the median income is $57,000, almost triple the salary of the worst-paying city. the median income for women is just under $22,000 a year in the -- >>> a new study by the federal trade commission found that as many as 40 million americans have errors in their report. bad credit profile can prevent you from getting loans, low interest rates or even a job. nbc's danielle leigh shows us how to spot problems and get them fixed. >> reporter: tuwana is one of the roughly 20% of americans with errors. >> there were quite a few errors, incredible address, incredible claims against myself, incredible birth dates. >> reporter: the food service employee discovered the errors only after she was denied a loan to start a food truck company. we met her last october. four months later she's still fighting to fix it. >> sometimes i think they want you to get frustrated and stop, but i can't. >> three companies dominate the industry. they determine your credit score based on how you pay your bills and how much dead you have. an exercise yoon spokesman says the agency takes all erro